PREVIOUS STUDIES OF THE METABOLISM OF CHILDREN. 13 



This increase he attributes wholly to differences in restlessness and 

 activity and the greater intensity of development of the muscular 

 system, an inherent restlessness which he thinks can not be controlled 

 with young boys. If his results obtained during sleep had been 

 reported, much more definite conclusions could have been drawn. 



Magnus-Levy and Folk, 1899. Magnus-Levy and Falk 1 presented 

 in 1899 the results of the first systematic study of the basal metab- 

 olism of normal individuals from childhood to old age. This research 

 was carried out with all the precautions exacted by the Zuntz school 

 as to quietness and accuracy of technique. The mouthpiece and the 

 Zuntz-Geppert apparatus in general were used for the study of the 

 basal metabolism of 11 boys and 9 girls, all 14 years old or younger. 



TABLE 6. Basal heat production of boys and girls (in lying position) (Magnus-Levy and Falk) 



1 Harris and Benedict, Carnegie Inst. Wash. Pub. No. 279, 1919, p. 238. 



At first thought it would seem difficult to make metabolism experi- 

 ments with children, especially with a child as young as 2f years, 

 with an apparatus using a mouthpiece. Nevertheless the results 

 show reasonably close agreement with each other. When it is re- 

 membered that these investigations were carried out fully 20 years 

 ago, it will be recognized that they represent a remarkable advance in 



1 Magnus-Levy and Falk, Archiv f. Anat. u. Physiol., 1899, Suppbd., p. 314. 



